Improvement in machines for shearing sheet metal



2 Sheet s-Sheet 2.

`c. E.. KENNEDY.V Machine for shearing Sheet-Metal.

No.219,2111 atented sept. 2,1879.

' removed.

Vwhen the carriage F is used.

UNITED STATES PATENT OFFICE CHARLES E. KENNEDY, OF HATLEY, QUEBEC,CANADA.

IMPROVEMENT IN MACHINES FOR SHEARING SHEET METAL.

Specification forming part of Letters Patent No. 219,271, datedSeptember 2, 1879 application iled March 18, 1879.

i ings, and to letters of reference marked thereon, which form a part ofthis specification.

The object of my invention is to provide a compact and simplearrangement of a radiusarm having an adjustable axis, and carrying atits free end clamping-plates and operatinghandles, with two pairs ofcutting-disks, the inner pair being made adjustable in such a mannerthat sheets of metal may be cnt into segmentsof circles of variouswidths, which, before being released, are carried to an adjust- Iabletable provided with knives or shears so shaped and arranged as to trimto the desired form those edges of the sheet not previously operated on,and producing asheet of the proper pattern for immediate forming intocups, dippers,cpans, Src., according as the machine is set for suchproducts. My invention also provides for the removal of the radius-armand the substitution of a carriage therefor, the carriage moving in aright line, and provided with clamps for holding sheet metal to be cutin parallel strips.

Figure 1 is a front elevation of a machine embodying my invention. Fig.2 isa vertical transverse section of the same, taken on the plane of theline ze, Figs.p1 and 3. Fig. 3 is a plan of the same. Fig. 4 is a frontelevation, showing the parallel cutting attachment as in use, theradius-arm and clipping-table being is the base; B, the upper guideway,C C', the standards; D, the clipping-table; E, the radius-arm, F,theparallel cutter-carriage.

The base A is made in one piece, and is provided with a slottedguideway, a, Fig. 3. At right angle-s with this is a track, j, used onlyTwo vertical standards spring from the base A, and carry 4 at theirsummitsthe guideway B. `The other extremity of the said guideway issupported by a semicircular guide-rest, b, supportedfat either end byuprights c, reaching to the base A. The radius-arm E is pivoted at al tothe top of the guideway B, Fig. 3, in one of the holes e e. The oppositeend of said radiusarm carries ahandle, f. Below this are clamps g,operated by a cam, h.

Referring to Figs. l and 3, it will be seen that the radius-arm alsocarries on the lefthand side a rectangularly-bent piece, t', whichserves to support the lower plate of the clamps g, which is placed atthe proper level with the cutting-disks m m o o to cut without raisingor lowering the edges of the sheet being operated on.

The frame G springs from the front righthand corner of the base A, andat the proper height extends horizontally to the left, at the end ofwhich ism'ounted the upper plano-convex cutting-disk, m', its convexside facing the radius-arm E.` Immediately below the disk m' is the one,m, made in the same shape, but having its convex side opposite the one,m', the peripheries of the plane sides being contiguous, and slightlyoverlapping in the manner in common practice with this class of cutters.The disk m is mounted on a vertical stud, Z, secured to the base A.

The cutting disks o o are arranged in the same manner as those m mdescribed, with the exception that the convex sides of the disks o m and0 m are reversed respectively. Disk ois journaled to the slidingstandard p, the upper one, o', being similarly supported by the hangerp', workin g in the horizontal slot q in the guideway B.' The base ofthe standard p slides in a slot in the base A, Fig. 3. The standard pand hanger p being horizontally adjustable in a line with the guidewayAB enables the distance between the disks m m and o o' to be increasedor decreased when desired; The radius-arm E is also adjustable, therebeing holes e e in the said radius-arm, and corresponding holes in theguideway B,one hole of each being pivoted together by the pin d,affording means for enlarging or reducing the circle described by theclamps g.

Adjustable stops r s t determine the position of the sheet to be cutwhen placed in the clamps g, which are carried toward the said stopsuntil arrested by the pin lc coming in contact with the radius-arm E. Asheet of metal having been placed in the clamps g in the proper positionfor trimming and securely clamped, the stop t is set to touch one end ofthe sheet, those s i" being similarly adjusted to engage with one edgeof the same, and there secured, thus insuring a like position in theclamps g of every subsequent sheet operated on.

The stop r, being at a point where projections on the sheets wouldstrike, is pi Voted with a finger which maintains its vertical positionby means of a coiled spring, thus permitting 'said finger to yield.

A sheethavingbeen placed in the said clamps and fastened by the cam h,when they are at the right hand of the cutters m m' and o o the free endof the radius-arm E is carried to the left by means of the handle f,during which operation two opposite edges ofthe sheet, coming in contactwith aforesaid cutting-disks, are trimmed to circles determined by theposition of the pivot d and the distance of the disks o o from the disksm m. A pill, lc, on the semicircular guide-rest b, insures a likeadjustment of every sheet, which, having been trimmedin the mannerdescribed, is carried by the said clamps to the clipping-table D,passing .beneath the knives y. v At the same time the clipping-table ispartially revolved by the lower clamp-support, z', entering a slot, u,in the said table.

A portion of the sleeve -w is cut away at a point to correspond with theposition of the pin v in the post w, being cut away in such amanner thatthe ends of this cut portion of the sleeve strike pin t when the table D(which is secured to said sleeve) is made to partially revolve by theclamp-support i entering or leaving the slot a in the table D. Therotation of the cam -support i, slot a, and pin fu is such that theslotted edge of the table D, when turned as far to the left as the pin twill permit, will always be in the proper position for the cam-support ito enter the slot u. This relation is also such that the table D, bymeans of the clamp-support i and slot a, may be turned to the rightuntil arrested in that direction by the said pin c, when lines parallelwith the shear edges of table D will cross each other on thelongitudinal line running through the center of motion of table D fromthe circle described by the outer edge of the sheet being operated on inits transit from the shears m m to the said table.

A foot-lever or other con venient device, connected with thevertically-sliding bar m, causes the cutting-edges of the knives y todescend below the plane of the top of the table D, clipping ot't' theends and corners not before operated on.

The bar .r slides on guides attached to the sleeve w', as shown, and isreturned to its original position by means of a spring, n.

Different-sized cli pping-tables D and knives y are used fordifferent-sized sheets.

When it is desired to cut sheets having parallel edges, the radius arm Eis'removed, and the carriage F placed on the track j, the said carriagebeing constructed to fit the said track and move truly thereon. The topof the carriage is provided with clamps g', similar t those g on theradius-arm E.

.By means of the handlef the carriage is propelled forward, when theedges of the sheet which has previously been clamped thereon are trimmedby the disks m fm', or by those and o o simultaneously.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The combination of the adjustable radiusarm E, adjustable clamp g,cam h, and frame i, as set forth.

2. The combination of frame B C G, an adj ustable radius-arm, E, framet', clamps g, and semicircular guide-rest b, substantially as set forth.1

3. The combination ofthe radius-arm E with the semicircular guide-rest band adjustable cutters o o', the former in the guideway B and the latterin the base A, substantially as set forth. j

4. The combination and arrangement of the adjustable stops r s t withthe radius arm E and clamps g, substantially as set forth.

5. The combination of the partially-revolving slotted table D, clamps g,and support i, substantially as shown and described.

6. In combination with a radius-arm, E, the clipping-table D, knives y,and bar a', operating substantially as set forth.

In testimony that I claim the foregoing as myown I aflix my signature inpresence of two witnesses.

CHARLES EDGAR KENNEDY.

Witnesses:

A. Gr. LITTLE, F. A. WIsWELL.

